GB/T 3103.2-1982 Fastener tolerances Bolts, screws and nuts for precision machinery

GB/T 3103.2-1982 Fastener Tolerances Bolts, Screws and Nuts for Precision Machinery GB/T3103.2-1982 Standard Download Decompression Password: www.bzxz.net

1 Introduction
National Standard of the People's Republic of China
Tolerances for fasteners
Bolts , screws and nuts for fine mechanics UDC 621.882
GB3103.2-82
(Confirmed in 1988)
This standard is equivalent to the international standard ISO4759/ⅡI1979 "Tolerances for fasteners - Part II: Bolts, screws and nuts for fine mechanics with thread diameters of 1 to 3 mm and product grade F". This standard specifies the tolerances for bolts, screws and nuts with thread diameters of 1 to 3 mm and product grade F. This standard applies to standard and non-standard fasteners for fine mechanics. Note: Product grade F is generally applicable to products with high tolerance requirements. 2 Surface
The surface roughness of the bearing surface and the head (except for edges, slots and cross slots) should be approximately equal to Ra = 1μm, determined by visual comparison. 3 Thread
Thread length
National Bureau of Standards 198205-22 issued
One pitch.
1983-07-01 implementation
Nominal length
6 Screw size
6.1 Width across flats and diagonal width
Actual measurement position
Slot width
GB 3103.282
m 20.8mmin
-Minimum height of nut.
Head diameter
Thread diameterWww.bzxZ.net
Thread diameter
GB3103.2-82
*For the roundness of the head of the cross recessed countersunk screw, see Table 6 and Figure 8. 294
7.2Head height
Nominal size
>0.8;<1.2
Nut height
9Rod diameter
GB 3103.2—82
d, center diameter
10Geometric tolerance
Hoortg
GB 3103.2—82
Basis for selecting tolerance
L1.5d / d
GB 3103.2—82
Continued Table 6
Basis for selecting tolerances
GB 3103.2-82
Continued Table 6
Basis for selecting tolerances
Additional Notes:
GB3103.2-82
This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard was drafted by the Standardization Research Institute of the Ministry of Machinery Industry. This standard was first issued in May 1982.
This standard was confirmed in April 1988.
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